Storage system and remote copy control method for storage system

a storage system and remote copy control technology, applied in the field of storage system and to a remote copy control method of a storage system, can solve the problems of large load on each host, difficult to maintain data consistency, and device has not yet been received, so as to achieve the effect of maintaining data consistency

Inactive Publication Date: 2007-10-04
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]This invention was devised in light of the above problems, and has as an object the provision of a storage system and a remote copy control method for a storage system which are able to maintain data consistency when transferring and updating data between a plurality of storage control devices. A further object of this invention is to provide a storage system an...

Problems solved by technology

Hence methods for backing up such data, or for promptly restoring a normal operating state after occurrence of a fault, are vital issues for storage technology.
In the above technology of the prior art, because the primary host and secondary host constantly perform data transfer and reflection processing (processing to write data to a volume in the order of the write time), the load on each host is considerable.
As a resu...

Method used

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  • Storage system and remote copy control method for storage system
  • Storage system and remote copy control method for storage system
  • Storage system and remote copy control method for storage system

Examples

Experimental program
Comparison scheme
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embodiment 1

[0084]FIG. 2 is an explanatory diagram showing the entirety of the storage system of this embodiment. This storage system comprises for example a primary site Ps and secondary site Ss, as well as a management server 43 to manage the sites Ps and Ss.

[0085]The primary site Ps can comprise one or more primary hosts 31, a plurality of primary storage control devices 10, and management terminals 41 which manage each of the primary storage control devices 10. Similarly, the secondary site Ss can comprise one or more secondary hosts 32, a plurality of secondary storage control devices 20, and management terminals 42. With respect to the correspondence with FIG. 1, the primary host 31 and secondary host 32 correspond to the primary host H1 and secondary host H2 respectively in FIG. 1. The primary storage control devices 10 correspond to the primary storage control devices 1 in FIG. 1, and the secondary storage control devices 20 correspond to the secondary storage control devices 2 in FIG. ...

embodiment 2

[0241]Next, processing to halt remote copying is explained. Processing to halt remote copying is also called suspend processing. In a system which performs remote copying, there are cases in which the need to halt remote copying arises. Such cases may be, for example, when performing maintenance of various equipment in the storage system, or when modifying the configuration of the storage system. In such cases, there is a need to halt remote copying.

[0242]In this embodiment, as explained above, all of the secondary storage control devices 20 cooperate to execute remote copy processing. Hence the secondary storage control devices 20 must cooperate to perform suspend processing.

[0243]A number of different types of suspend processing exist, depending on the source of the instruction to halt copying (the suspend instruction source) and the specifications relating to suspend processing (for example, specifications relating to the processing time and processing results). The suspend instr...

embodiment 3

[0264]FIG. 18 is a flowchart showing purge suspend processing. Purge suspend processing, similarly to flush suspend processing, is processing to halt copying with consistency maintained. However, purge suspend processing differs from flush suspend processing in that, with respect to updates to primary volumes 530A performed before the suspend request is issued, copy halting is completed without waiting for updates to secondary volumes 530B of write data.

[0265]The management portion 311 of the primary host 31 issues a suspend request, specifying “purge” as the suspend type, to a prescribed primary storage control device 10 via the data input / output paths CN11 (S131). Here, the prescribed primary storage control device 10 is any of the primary storage control devices 10 having a primary volume group 540A corresponding to the extended group 550 which is a suspend object.

[0266]Upon receiving this purge suspend request, the primary storage control device 10 notifies the secondary storage...

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PUM

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Abstract

A storage system of this invention maintains consistency of the stored contents between volumes even when a plurality of remote copying operations are executed asynchronously. A plurality of primary storage control devices and a plurality of secondary storage control devices are connected by a plurality of paths, and remote copying is performed asynchronously between respective first volumes and second volumes. Write data transferred from the primary storage control device to the secondary storage control device is held in a write data storage portion. Update order information, including write times and sequential numbers, is managed by update order information management portions. An update control portion collects update order information from each update order information management portion, determines the time at which update of each second volume is possible, and notifies each-update portion. By this means, the stored contents of each second volume can be updated up to the time at which update is possible.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application relates to and claims priority from Japanese Patent Application No. 2006-87983, filed on Mar. 28, 2006, the entire disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This invention relates to a storage system and to a remote copy control method for a storage system.[0004]2. Description of the Related Art[0005]In the computer systems of recent years, the quantities of data used are increasing, and data is also updated with increasing frequency. Hence methods for backing up such data, or for promptly restoring a normal operating state after occurrence of a fault, are vital issues for storage technology.[0006]As one solution to such problems, technology has been proposed in which, for example, a plurality of storage control devices *are placed in both a primary site and a secondary site, mutually separated, each of the storage control devices at the primary...

Claims

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Application Information

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IPC IPC(8): G06F12/16
CPCG06F11/2064G06F2201/855G06F11/2074
Inventor ARAKAWA, HIROSHININOSE, KENTADEGUCHI, AKIRAOKUMOTO, KATSUHIRO
Owner HITACHI LTD
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